I've build the Sonic Multiplier (ring modulator) kit. The sine wave oscillator doesn't work yet. The control voltage inputs (fine and coarse) from the front panel work, but no oscillation. I've inspected the board carefully, and double-checked all part values. I'm not sure how to troubleshoot an oscillator. It's a stage variable filter that's supposed to oscillate. Anybody have any ideas how to troubleshoot this?

[quote="RF"]Ray has a note on the schematic about changing R46 if you are using 15 Volts...

Wow that worked! Thanks much for the quick and correct reply! I changed it to 47k and now it oscillates. The output is a trapazoid instead of a sine. I put a 100k pot there instead and now I can vary the shape until it's a nice looking sine wave.

Hi, i use 12v +/- and had the same problem, i hooked up to my scope and the output of the sine was very low, i first thought it might need more gain but it was the filter needing kickstarted into self ocsillation, had me stumped for a couple of hours, works fine now._________________epicyclus@skrogmusic.plus.com

Hi,
I am testing the Sonic Multiplier that I have built tonight.
Both the two preamp sections and ring modulation section are working.
I got no internal sine. Listening from the sine out all I can hear is a tiny sound just wich seems a filter when resonance is turned just before starting self oscillating..
I am running on +/-12V and I checked all resistor values...
Any suggestion?
tommi_________________http://soundcloud.com/mister-vommihttp://tideofsound.net

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